unfortunatelly it seems like get_template_directory_uri() doesn’t point to the right theme-folder – in HTML-Code I got this result:
<link rel=’stylesheet’ id=’fontello-css’
href=’…./wp-content/themes/generatepress/fontello-ee6ff678/css/fontello.css?ver=1.0′
type=’text/css’ media=’all’ />

although it should load from …/themes/generatepress-child/…

any idea?
-> I googled arround a bit and I just wondered about the separate
child-theme-folder – WordPress told me today, that I’m not useing a
child-theme… I found out, that the proper way of creating a
child-theme is to create a “child” folder underneath the
main-theme-folder… did this change in last recent versions?